Her accent flips worryingly from American to Irish in this. Which is she meant to be?

She's playing an American teenager from Manhattan - though she fails to put on even a subtle NYer accent (I guess it depends on where the character grew up and all, but still ... ). But I agree, her accent was a bit uneven, dropping it here and there - nothing too much, though.

Once the movie comes out, for some reason I feel her fans will say it's a "perfect" American accent to even saying "I heard the NYer accent! It was just a subtle one. You must be deaf!" I must be. Fanboys.